This study aimed to show the significance of hematological parameters in assessing the structural and functional status of animals exposed to aquatic toxicants. Juveniles of the freshwater prawn Macrobrachium rosenbergii were exposed to 0.1 of LC50 (96 h) of carbosulfan for 96 hr. Sampling of the haemolymph of the treated and control prawns was performed 24, 48, 72, and 96 hrs from exposure. The total and differential haemocyte counts (THC and DHC) in Macrobrachium rosenbergii were affected by carbosulfan. Total haemocyte count (THC) of exposed prawn was significantly reduced. Three major types of haemocytes namely, hyaline, small, and large granule haemocytes were detected. The proportion of granule haemocytes was declined in prawns, after exposure to carbosulfan. Also, some morphological aberrations in haemocyte cells such as irregularity in their shape and ragged cytoplasmic membrane, vaculation in cytoplasm and nucleus, as well as extrusion of nuclear material were observed in exposed prawns. Haemolymph glucose was significantly increased (hyperglycemia) up to 72 hrs, and then decreased (hypoglycemia) at 96 hrs. As the result of the above effects, the level of alkaline phosphatase (ALP) was found to decrease in the haemolymph of exposed prawns. On the other hand, total haemolymph protein (THP) of Macrobrachium rosenbergii exposed to 0.1 LC50 of carbosulfan showed significant increase when compared to unexposed control prawns.
Key words: Macrobrachium rosenbergii,.carbosulfan, haemolymph, total haemolymph protein, enzymes, glucose.
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